ABB UC Series, Руководство по обслуживанию

Страница: 21 / 36

1ZSE 5492-124 en, Rev. 6
| Maintenance guide UCG
21
When the diverter switch is lowered, check visually that its
plug-in contacts are aligned with the contacts in the cylinder
wall.
In order to ensure that the diverter switch pin has engaged
the coupling disc, carry out at least
three tap change
operations in
one
direction. A distinct sound is heard when
the diverter switch operates which indicates that the driving
pin of the diverter switch has been connected.
If no sound is heard, the diverter switch might need to be
pushed down while operating the motor-drive.
Carry out another three operations in the same direction while
pushing the diverter switch down.
The top part of the diverter switch lifting device should be
below the level of the machined surface for the cover when
lowered to its final position. Only the springs of the lifting
device should be above this level.
If a check of contact timing should be carried out, proceed
with that according to section 3.19 before mounting the
cover.
Insert a new O-ring for the cover in the upper flange. Mount
the on-load tap-changer cover. Turn the cover so the guiding
pin in the housing is facing the guiding hole in the cover.
(The cover has to be pressed down in order to overcome
the spring force of the springs which hold the diverter switch
pressed in place.) Insert screws and washers and tighten
them.
3.14 Checking and replacing supervisory equipment
Accessories and safety devices that are not standard, but
might be mounted at delivery, are described in instruction
1ZSC000562-AAD.
A A
A–A
Fig. 8. Diverter switch.
Shielding-ring
(when the impulse
withstand voltage
to earth exceeds
380 kV) (not
on UCG short
version)
Plug-in contacts
Driving pin
Tie rod
Guiding pin
Guiding pin
Serial number
(on the opposite
side of the
diverter switch)
Lifting device
Springs
Lifting eye
Coupling disc
Fig. 9. UCG diverter switch housing, view from above.
Holes for
guiding pins
Guiding pins
Slot for the oil
draining tube
Slot for
guiding bar
Oil draining tube
Notch for the
guiding pin